Hydrogen sulphide control in sewage collection systems
Hydrogen sulphide control in sewage collection systems
(OP)
I would like to get dosage requirements for the various chemicals used to treat H2S in force mains and trunk sewers.
Chemicals of interest are KMnO4, Mg(OH)2, FeCl2, FeCl3, NaNO3, CaNO3, H2O2, ClO2.
Chemicals of interest are KMnO4, Mg(OH)2, FeCl2, FeCl3, NaNO3, CaNO3, H2O2, ClO2.





RE: Hydrogen sulphide control in sewage collection systems
RE: Hydrogen sulphide control in sewage collection systems
RE: Hydrogen sulphide control in sewage collection systems
Yes, we have an interest in knowing how much to dose chemicals in order to either suppress H2S formation or control of pH etc in the scrubbing functions where H2s removal is being attempted.
At this stage I can give only preliminary design requirements, but please feel free to contact me at :
atulbhalla@infl.net
RE: Hydrogen sulphide control in sewage collection systems
We can't figure out the dosing requirements without flow information and a good understanding of the characteristics of your wastewater. My rule of thumb has been to first understand why you are getting H2S which in your case since you had no flow information would most likely be attributed to low flows on an overdesigned system. Planning on eliminating H2S formation or reducing it would give you such a great understanding of your system that sizing chemical feeds and types of chemicals would become second nature to you form the experience.
The more information you give us the better we can help.
Bob
RE: Hydrogen sulphide control in sewage collection systems
Problem:
1. Hydrogen sulphide is to be removed from a continuous biogas stream containing approx. 3% of H2S. Gas flow is approx. 14,000 cu.m / day (min. 7000, max 17,000 cu.m /day) at ambient temperature and approx. 70-100 mm WC. Biogas also contains approx. 65% methane and balance is predominantly carbon dioxide. Cleaned gas is meant to be used for power generation in a combustion ignition / dual fuel gas engine. Cleaned gas should have less than 500 ppm H2S, preferably lower, since the feed gas flow may fluctuate depending upon inflow conditions to the bio-methanation reactors.
2. The initial cost of the gas cleaning system and also its operating and maintenance costs must be low. The costs should be based on plant fabricated, erected and operated in India, under the tropical to semi-tropical conditions prevailing in various parts of the country.
PS: at present there is a simple water wash system in a drum for the biogas to get partially cleaned. Subsequently, the pressure is boosted in a twin lobe compressor(cheap & local make) for conveying the biogas to a boiler. Any equipment required to be installed can be made available, either as bought out or fabricated.
Atul Bhalla
RE: Hydrogen sulphide control in sewage collection systems